[Bug tree-optimization/57245] Floating-point constant truncation ignores -frounding-math

[nsz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57245

--- Comment #3 from nsz at gcc dot gnu.org ---
note that this may cause the omission of underflow, overflow and inexact
exceptions too (so in principle it's an invalid transformation even
without -frounding-math but with -ftrapping-math ):

float x,y;
void f(void)
{
  x = 0x1p-1000; // truncated to 0
  y = 0x1p1000; // truncated to inf
}